When a woman purposely sabotages her man's look in order to make him less attractive to the opposite sex, much like Moxie drinkers can leave their nasty tasting soda in the fridge for months untouched by anyone who is thirsty, tap water is a better option. Anyone who drinks Moxie assures themselves that nobody will ever touch their soda.

Gisele Bundchen telling Tom Brady his scraggly looking hair looks "great". Clearly she has an arterial motive of making him less attractive to other models thus the Moxie Effect.